Structure and thermal relaxation of network units and crystallization of lithium silicate based glasses doped with oxides of Al and B

Literature Information

Publication Date 2017-09-08
DOI 10.1039/C7CP01690E
Impact Factor 3.676
Authors

Hugo R. Fernandes, Bertrand Doumert, Lionel Montagne, José M. F. Ferreira


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Abstract

The current study reports on the relaxation behaviour of lithium silicate based glasses as probed by NMR spectroscopy. A total of four glass compositions were studied with the parent composition being 28Li2O–72SiO2, and added dopants of Al and B. All the compositions showed significant differences in the NMR spectra of both annealed and non-annealed glasses demonstrating the structural relaxation behaviour. We extended our binary statistical mechanical model to these complex compositions to study the relaxation behaviour. By the combined use of the extended statistical mechanical model and broken ergodicity, we shed light on the mechanism of structural relaxation as understood by NMR spectroscopy. We studied the crystallization behaviour of the glasses and reported on the variations of the residual glass composition changes in the crystallization fraction.

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Physical Chemistry Chemical Physics
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